Spool for photographic films.



J. E. LINDEN SPOOL FOR PHOTOGRAPHIC FILMS,

APPLICATION ,FILED MAY 7. l9! 7.v

Patentd Apr. 9, 1918.

flue m4 01 o JOHN ERICK LINDEN, 0L DULUTH, MINNESGTA.

829031 FOR PHOTOGRAPHIC FILMS.

naeneae.

To all whom it may concern:

Be it known that 1, JOHN E. LINDEN, a citizen or the United States,residing at Duluth, in the county of Saint Louis and State of Minnesota,have invented certain new and useful Improvements in Spools forPhotographic Films; and I do declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same.

This invention relates to certain new and useful improvements in spoolsused primarily in photography for winding films thereon.

One object of the invention is to provide a spool which may be formedfrom a single piece of material, preferably sheet metal, I

thus making the spool very light and a rather inexpensive article.

Another object or" the invention is to provide a spool designedparticularly for holding films, the spool being provided with animproved means for securing one end of the film thereto.

A further object of the invention isto generally improve 11 on devicesof this class by the provision 0 an extremely simple, strong, anddurable construction, one which will be eficient and reliable inoperation, and well adapted to the purpose for which it is designed.

With these and other objects in view, the invention consists of certainnovel features of construction, and the combination and arrangement ofparts as will be hereinafter fully described and claimed.

In the accompanying drawing forming a part of the application, and inwhich similar reference characters designate like parts throughout theseveral views:

Figure 1 is a plan view of a blank fronr which one of the improvedspools may be formed.

Fl 2 is a side elevation of one of the spoo s;

Fig. 3 is a longitudinal sectional view thereof;

Fig. 4 is a transverse sectional view taken on the plane indicated bythe line H of Fig. 3; and

Fig. 5 is a similar view taken on the plane indicated by the line 55 ofFig. 2.

Referring more particularly to the drawing, the numeral 1 desi ates asplit tubular stem having overlapping edges as shown,

Specification of Letters Eatent.

Application filed Kay 7, 1917.

Patented Apr. 9, 191%.

Serial Ho. 186,938.

connecting the head members 3 to the stem 1,

while the lugs 5 are in efiect braces for preventing said head membersfrom being easily bent out of place. The lugs 2 and 5 extending inopposite directions and being disposed upon opposite sides of the stem1, provide a rather rigid mounting of the head members with respect tothe stem.

Que edge of the stem 1, preferably the innermost edge, is provided witha shallow notch 6 to form a longitudinally extending slot in the stemfor the reception of one end of the backing strip carrying the film.This backing sheet, designated by the letter a, being of comparativelyheavy and still paper, has a tendency not to be folded sharplyorcreased, and hence when it is inserted in the slot in the spool, it willengage the edges of the slot and will ofier much resistance toward beingremoved after the backing strip is wound about a half a turn or morearound the stem 1. The strip a, however, can be readily and easilydisconnected from the spool by unwinding it completely and pulling ittransversely out of the slot. The biting action onl takes place when thestrip is bent around t e outer edge of the stem.

One of the head members 3 is provided with a centrally arranged circularopenin 7 which is adapted to receive the pivot stud in an ordinaryfolding camera, while the other head member is provided with anelongated opening 8 adapted to receive the shank portion of the filmwinding key of the camera.

While the invention is primarily intended for use in connection with theart of photography, for holding roll films, yet it is obvious that thespool construction may be utilized for numerous other purposes, andhence it is to be understood that I do not wish to limit the use of theinvention in any manner.

Numezoiis oiieioges in form, proportion, and in the minor deizeiis ofconstruction may be resorted to Wiiiiout depertin from the spirit of theinvention, and ii t erefore do moi; wish to be iimi'sedi to the preciseeonstruoiion herein shown and descriioeoi.

I claim:

A spool formed "from a single piece of meteriel oomprismg e iii-millerspilt stem having overlapping edges the in neimost edge having o sheiiowooocii therein $0 provide seici seem with e longitudinally extendingslot ouswerdiy emending lugs formed said. stem end spaced the emos ozedges mere'of, heed members iiitegseiiy uniteri Wiih seic'i lugs end.folded in superposed relation thereon, and edliiiionei out- Wfliiiigextending lugs formed mt the ends of said stem end disposed adjacent oneedge thereof, the edges of said head members being crimpeoi inwardierouni the free ends of the lest mentione lugs.

in testimony whereof I hove hereunto set mv bend. in the presence of twosubscribing Winesses.

JQHN ERICK LINDEN.

itnesses:

